DeanOBanion.com
- Website includes a biography, photos, document downloads, and links to books about the Chicago crime boss.
- http://www.deanobanion.com/

FBI: Ten Most Wanted Fugitive: James J. Bulger
- Bureau information on South Boston gang leader "Whitey" Bulger. Includes photographs and video clips.
- http://www.fbi.gov/wanted/topten/fugitives/bulger.htm

The Brothers Bulger
- Site contains video clips, photographs and biographical information relating to James "Whitey" Bulger and associates. Also reviews of a Bulger biography.
- http://whiteyworld.com/

Wikipedia: James J. Bulger
- Article looks at the life and criminal career of the South Boston Irish gang boss.
- http://en.wikipedia.org/wiki/James_J._Bulger

Crime Library: James "Whitey" Bulger
- Writer Anthony Bruno discusses the underworld career of the Irish-American mob boss of South Boston.
- http://www.crimelibrary.com/gangsters_outlaws/mob_bosses/james_whitey_bulger/

FBI: Freedom of Information Act: George "Bugs" Moran
- Bureau records on the Chicago North Side gangster.
- http://foia.fbi.gov/foiaindex/moran_george_bugs.htm

Bugs Moran Online
- Site discusses the life and career of Chicago's Prohibition Era gangster. Includes photos, arrest records, descriptions of published works.
- http://www.bugsmoran.net/

Hell's Kitchen Irish Mob
- Short biographical notes on the bosses and famous members of the New York gang known as "The Westies."
- http://www.gangland.net/westies.htm

Wikipedia: Mad Dog Coll
- Article looks at the life and career of New York's Prohibition Era gangster Vincent Coll.
- http://en.wikipedia.org/wiki/Mad_Dog_Coll

Wikipedia: Owney Madden
- Biographical essay on the New York gangster of the Prohibition Era.
- http://en.wikipedia.org/wiki/Owney_Madden

Wikipedia: Irish Mob
- Article looks at the history of Irish gangs in Boston, New York, Philadelphia, Chicago and elsewhere.
- http://en.wikipedia.org/wiki/Irish_Mob

Crime Library: Dion O'Banion: Shamrocks, Gun Smoke and Beer Kegs
- Writer Joseph Geringer's feature on Chicago's North Side gangster.
- http://www.crimelibrary.com/gangsters_outlaws/mob_bosses/obanion/

Crime Library: George "Bugs" Moran: His War With Al Capone.
- Writer Joseph Geringer studies the man for whom Capone arranged the St. Valentine's Day Massacre.
- http://www.crimelibrary.com/gangsters2/moran/